Deprecate or remove sqlite3.OptimizedUnicode

[erlend-aasland]

BPO	42264
Nosy	@vstinner, @berkerpeksag, @serhiy-storchaka, @pablogsal, @erlend-aasland
PRs	bpo-42264: Deprecate sqlite3.OptimizedUnicode #23163

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-11-17.16:20:23.996>
created_at = <Date 2020-11-04.21:24:26.601>
labels = ['library', '3.10']
title = 'Deprecate or remove sqlite3.OptimizedUnicode'
updated_at = <Date 2020-11-17.16:20:23.995>
user = 'https://github.com/erlend-aasland'

bugs.python.org fields:

activity = <Date 2020-11-17.16:20:23.995>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-17.16:20:23.996>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2020-11-04.21:24:26.601>
creator = 'erlendaasland'
dependencies = []
files = []
hgrepos = []
issue_num = 42264
keywords = ['patch']
message_count = 2.0
messages = ['380363', '381252']
nosy_count = 5.0
nosy_names = ['vstinner', 'berker.peksag', 'serhiy.storchaka', 'pablogsal', 'erlendaasland']
pr_nums = ['23163']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42264'
versions = ['Python 3.10']

[erlend-aasland]

Ref. discussion on #67337: #23148 (comment)

OptimizedUnicode was obsoleted and undocumented in Python 3.3 (see commit 86dc732).

Suggesting to either deprecate OptimizedUnicode in 3.10 and remove it in 3.11, or just simply remove it in 3.10.

Relevant history:
48b13f0 (undoc)
bc35beb (clean up and undoc, closing bpo-13921)

(Pablo, adding you to nosy since you're the release manager; hope that's ok)

[serhiy-storchaka]

New changeset a1f401a by Erlend Egeberg Aasland in branch 'master':
bpo-42264: Deprecate sqlite3.OptimizedUnicode (GH-23163)
a1f401a